drivers/usb/chipidea/usbmisc_imx.c

   1 /*
   2  * Copyright 2012 Freescale Semiconductor, Inc.
   3  *
   4  * The code contained herein is licensed under the GNU General Public
   5  * License. You may obtain a copy of the GNU General Public License
   6  * Version 2 or later at the following locations:
   7  *
   8  * http://www.opensource.org/licenses/gpl-license.html
   9  * http://www.gnu.org/copyleft/gpl.html
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/of_platform.h>
  14 #include <linux/clk.h>
  15 #include <linux/err.h>
  16 #include <linux/io.h>
  17 #include <linux/delay.h>
  18
  19 #include "ci_hdrc_imx.h"
  20
  21 #define MX25_USB_PHY_CTRL_OFFSET        0x08
  22 #define MX25_BM_EXTERNAL_VBUS_DIVIDER   BIT(23)
  23
  24 #define MX27_H1_PM_BIT                  BIT(8)
  25 #define MX27_H2_PM_BIT                  BIT(16)
  26 #define MX27_OTG_PM_BIT                 BIT(24)
  27
  28 #define MX53_USB_OTG_PHY_CTRL_0_OFFSET  0x08
  29 #define MX53_USB_UH2_CTRL_OFFSET        0x14
  30 #define MX53_USB_UH3_CTRL_OFFSET        0x18
  31 #define MX53_BM_OVER_CUR_DIS_H1         BIT(5)
  32 #define MX53_BM_OVER_CUR_DIS_OTG        BIT(8)
  33 #define MX53_BM_OVER_CUR_DIS_UHx        BIT(30)
  34
  35 #define MX6_BM_OVER_CUR_DIS             BIT(7)
  36
  37 struct usbmisc_ops {
  38         /* It's called once when probe a usb device */
  39         int (*init)(struct imx_usbmisc_data *data);
  40         /* It's called once after adding a usb device */
  41         int (*post)(struct imx_usbmisc_data *data);
  42 };
  43
  44 struct imx_usbmisc {
  45         void __iomem *base;
  46         spinlock_t lock;
  47         struct clk *clk;
  48         const struct usbmisc_ops *ops;
  49 };
  50
  51 static struct imx_usbmisc *usbmisc;
  52
  53 static int usbmisc_imx25_post(struct imx_usbmisc_data *data)
  54 {
  55         void __iomem *reg;
  56         unsigned long flags;
  57         u32 val;
  58
  59         if (data->index > 2)
  60                 return -EINVAL;
  61
  62         reg = usbmisc->base + MX25_USB_PHY_CTRL_OFFSET;
  63
  64         if (data->evdo) {
  65                 spin_lock_irqsave(&usbmisc->lock, flags);
  66                 val = readl(reg);
  67                 writel(val | MX25_BM_EXTERNAL_VBUS_DIVIDER, reg);
  68                 spin_unlock_irqrestore(&usbmisc->lock, flags);
  69                 usleep_range(5000, 10000); /* needed to stabilize voltage */
  70         }
  71
  72         return 0;
  73 }
  74
  75 static int usbmisc_imx27_init(struct imx_usbmisc_data *data)
  76 {
  77         unsigned long flags;
  78         u32 val;
  79
  80         switch (data->index) {
  81         case 0:
  82                 val = MX27_OTG_PM_BIT;
  83                 break;
  84         case 1:
  85                 val = MX27_H1_PM_BIT;
  86                 break;
  87         case 2:
  88                 val = MX27_H2_PM_BIT;
  89                 break;
  90         default:
  91                 return -EINVAL;
  92         };
  93
  94         spin_lock_irqsave(&usbmisc->lock, flags);
  95         if (data->disable_oc)
  96                 val = readl(usbmisc->base) | val;
  97         else
  98                 val = readl(usbmisc->base) & ~val;
  99         writel(val, usbmisc->base);
 100         spin_unlock_irqrestore(&usbmisc->lock, flags);
 101
 102         return 0;
 103 }
 104
 105 static int usbmisc_imx53_init(struct imx_usbmisc_data *data)
 106 {
 107         void __iomem *reg = NULL;
 108         unsigned long flags;
 109         u32 val = 0;
 110
 111         if (data->index > 3)
 112                 return -EINVAL;
 113
 114         if (data->disable_oc) {
 115                 spin_lock_irqsave(&usbmisc->lock, flags);
 116                 switch (data->index) {
 117                 case 0:
 118                         reg = usbmisc->base + MX53_USB_OTG_PHY_CTRL_0_OFFSET;
 119                         val = readl(reg) | MX53_BM_OVER_CUR_DIS_OTG;
 120                         break;
 121                 case 1:
 122                         reg = usbmisc->base + MX53_USB_OTG_PHY_CTRL_0_OFFSET;
 123                         val = readl(reg) | MX53_BM_OVER_CUR_DIS_H1;
 124                         break;
 125                 case 2:
 126                         reg = usbmisc->base + MX53_USB_UH2_CTRL_OFFSET;
 127                         val = readl(reg) | MX53_BM_OVER_CUR_DIS_UHx;
 128                         break;
 129                 case 3:
 130                         reg = usbmisc->base + MX53_USB_UH3_CTRL_OFFSET;
 131                         val = readl(reg) | MX53_BM_OVER_CUR_DIS_UHx;
 132                         break;
 133                 }
 134                 if (reg && val)
 135                         writel(val, reg);
 136                 spin_unlock_irqrestore(&usbmisc->lock, flags);
 137         }
 138
 139         return 0;
 140 }
 141
 142 static int usbmisc_imx6q_init(struct imx_usbmisc_data *data)
 143 {
 144         unsigned long flags;
 145         u32 reg;
 146
 147         if (data->index > 3)
 148                 return -EINVAL;
 149
 150         if (data->disable_oc) {
 151                 spin_lock_irqsave(&usbmisc->lock, flags);
 152                 reg = readl(usbmisc->base + data->index * 4);
 153                 writel(reg | MX6_BM_OVER_CUR_DIS,
 154                         usbmisc->base + data->index * 4);
 155                 spin_unlock_irqrestore(&usbmisc->lock, flags);
 156         }
 157
 158         return 0;
 159 }
 160
 161 static const struct usbmisc_ops imx25_usbmisc_ops = {
 162         .post = usbmisc_imx25_post,
 163 };
 164
 165 static const struct usbmisc_ops imx27_usbmisc_ops = {
 166         .init = usbmisc_imx27_init,
 167 };
 168
 169 static const struct usbmisc_ops imx53_usbmisc_ops = {
 170         .init = usbmisc_imx53_init,
 171 };
 172
 173 static const struct usbmisc_ops imx6q_usbmisc_ops = {
 174         .init = usbmisc_imx6q_init,
 175 };
 176
 177 int imx_usbmisc_init(struct imx_usbmisc_data *data)
 178 {
 179         if (!usbmisc)
 180                 return -EPROBE_DEFER;
 181         if (!usbmisc->ops->init)
 182                 return 0;
 183         return usbmisc->ops->init(data);
 184 }
 185 EXPORT_SYMBOL_GPL(imx_usbmisc_init);
 186
 187 int imx_usbmisc_init_post(struct imx_usbmisc_data *data)
 188 {
 189         if (!usbmisc)
 190                 return -EPROBE_DEFER;
 191         if (!usbmisc->ops->post)
 192                 return 0;
 193         return usbmisc->ops->post(data);
 194 }
 195 EXPORT_SYMBOL_GPL(imx_usbmisc_init_post);
 196
 197 static const struct of_device_id usbmisc_imx_dt_ids[] = {
 198         {
 199                 .compatible = "fsl,imx25-usbmisc",
 200                 .data = &imx25_usbmisc_ops,
 201         },
 202         {
 203                 .compatible = "fsl,imx27-usbmisc",
 204                 .data = &imx27_usbmisc_ops,
 205         },
 206         {
 207                 .compatible = "fsl,imx53-usbmisc",
 208                 .data = &imx53_usbmisc_ops,
 209         },
 210         {
 211                 .compatible = "fsl,imx6q-usbmisc",
 212                 .data = &imx6q_usbmisc_ops,
 213         },
 214         { /* sentinel */ }
 215 };
 216 MODULE_DEVICE_TABLE(of, usbmisc_imx_dt_ids);
 217
 218 static int usbmisc_imx_probe(struct platform_device *pdev)
 219 {
 220         struct resource *res;
 221         struct imx_usbmisc *data;
 222         int ret;
 223         struct of_device_id *tmp_dev;
 224
 225         if (usbmisc)
 226                 return -EBUSY;
 227
 228         data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
 229         if (!data)
 230                 return -ENOMEM;
 231
 232         spin_lock_init(&data->lock);
 233
 234         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 235         data->base = devm_ioremap_resource(&pdev->dev, res);
 236         if (IS_ERR(data->base))
 237                 return PTR_ERR(data->base);
 238
 239         data->clk = devm_clk_get(&pdev->dev, NULL);
 240         if (IS_ERR(data->clk)) {
 241                 dev_err(&pdev->dev,
 242                         "failed to get clock, err=%ld\n", PTR_ERR(data->clk));
 243                 return PTR_ERR(data->clk);
 244         }
 245
 246         ret = clk_prepare_enable(data->clk);
 247         if (ret) {
 248                 dev_err(&pdev->dev,
 249                         "clk_prepare_enable failed, err=%d\n", ret);
 250                 return ret;
 251         }
 252
 253         tmp_dev = (struct of_device_id *)
 254                 of_match_device(usbmisc_imx_dt_ids, &pdev->dev);
 255         data->ops = (const struct usbmisc_ops *)tmp_dev->data;
 256         usbmisc = data;
 257
 258         return 0;
 259 }
 260
 261 static int usbmisc_imx_remove(struct platform_device *pdev)
 262 {
 263         clk_disable_unprepare(usbmisc->clk);
 264         usbmisc = NULL;
 265         return 0;
 266 }
 267
 268 static struct platform_driver usbmisc_imx_driver = {
 269         .probe = usbmisc_imx_probe,
 270         .remove = usbmisc_imx_remove,
 271         .driver = {
 272                 .name = "usbmisc_imx",
 273                 .owner = THIS_MODULE,
 274                 .of_match_table = usbmisc_imx_dt_ids,
 275          },
 276 };
 277
 278 module_platform_driver(usbmisc_imx_driver);
 279
 280 MODULE_ALIAS("platform:usbmisc-imx");
 281 MODULE_LICENSE("GPL v2");
 282 MODULE_DESCRIPTION("driver for imx usb non-core registers");
 283 MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>");